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  1. Biss73

    Factor F in nozzle reinforcement calculation

    Hi, Does anybody know the reason why a Factor F less than one cannot be used on openings that are not integrally reinforced? Is it to prevent creative repads that are not all-around or uneven? Regards, Serge
  2. Biss73

    Bend vs rolled cone in fatigue

    Hi, I have a cone in my div 1 pressure vessel and I was asked if it was possible to have the cone made by bending instead of rolling. Since this vessel will have many cycles (±400,000), I have doubts that it would be advantageous since each bend should be considered as peaking and they would...
  3. Biss73

    Environmental modification factor fe in fatigue analysis

    Hi, I am doing a fatigue analysis and I was having questions regarding the environmental modification factor fe (as per ASME Section VIII, div 2, art 3.F.2.2.c). Note that this vessel is div 1, so I don’t have a user's design specification from the client specifying this factor. The code says...
  4. Biss73

    Inconel 625 weld overlay Fe content

    Hi, We want to buy a new vessel with inconel 625 weld overlay. The client specification says that the production weld chemistry of Ni alloy such as 625 corrosion resistant weld overlay on the carbon steel base material shall be equal to or better than their respective Ni alloy pipe/plate...
  5. Biss73

    Helical strakes on stack

    Hi, We are designing a stack which the bottom half is in a building while the rest is exposed to the wind. According to ASME STS-1, we need to install helical strakes which are supposed to cover 1/3 of the stack. Does anybody know if it needs to cover 1/3 of the part exposed to the wind or 1/3...
  6. Biss73

    Energy transfered on impact by a crumbling object

    Hi, I'm working on the demolition of a stack and we plan on cutting the stack in sections and removing those one at a time with a crane. The problem I have is that inside this stack there is refractory material and we need to block the bottom of the section with a plate to avoid having chunk of...
  7. Biss73

    Firebox quality steel

    Hi, I'm working on an 1948 heat exchanger which has a shell in SA-201 Gr B FBQ. Does an FBQ grade steel respects by default ASTM A300? If yes, is the -50F minimum temperature requirement (seen in some threads) valid for all steel under A300? If no, does anyone know what is the minimum...

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